The "Boy-cube".
The first implicit equation of the Boy surface was given by the French mathematician Apéry, who was able to achieve this result because I had shown that this surface could be described using elliptical meridians. The Boy surface is extensively described in my comic book "Le Topologicon" (see the "cd-Lanturlu"). I invented the "Boy-Cube" in 1983. All assembly instructions can be found in the Topologicon, page 47.